HP SIM 7.3 - Deploy firmware ILO2 2.07 -> 2.23 fails from HPSIM

I have a Linux Red Hat Enterprise 6u3 x86_64 DL360 G6 system in HPSIM. When I try and push an ilo2 firmware update from version 2.07 to 2.23 using HPSIM I get the following error:

Status ? Dependency Failure among components

Checking for HPSUM dependencies! One or more HPSUM dependencies are missing! Please refer to the HPSUM user manual for HPSUM dependencies list. Unable to continue in absence of HPSUM dependencies. Skipping installation.

I can update the system manually using the CP021881.scexe firmware bundle but I want to be able to use HPSIM to manage fw.